Molder&#39;s flask



,1 March 29 927 H. D. BICKFORD 1,622,623y

MOLDERS FLASK Filed May 20,'1926 M fam/mn:

Patented Mar. 29, 1927.

f f' 1,622,623y

HAROLD D. BICKFQRD, OF WATERVILLE,'MAINE.

MOLDERS FLASK.

Application filed May 2o,

This invention relates to molders flasks which are often made of wood or other inflammable material. Such flasks are used in iron or brass foundries to hold the sand for the casting. When the hot molten metal is poured into the mold, gases are formed in the mold at high temperatures. These gases find their' way out through the pores and minute voids in the body of the sand and particularly at the parting line, and reach the air through the crack between adjacent members of the flask. Such is the temperature of the gases that they spontaneously burst into flames upon reaching the air. The flames of the burning gases char the outer edges of the members of the flask along the line of meeting before they can be extinguished. This successive charring of this portion of the flask materially shortens the life of the flask and makes repairs or renewals too frequent. An object of my invention is to prevent burning or charring of the edges of the flask members by providing a duct to collect and lead away the hot gases, discharging them into the air at points where no harm will bedone if they ignite.

Further advantageous features of construction will be apparent from the disclosure of the invention in the following description of the device and on the drawings, of which Figure 1 is a plan view of a molders flask.

Figure 2 is a side elevation of the same.

Figure 3 is a worms eye view of aportion of the upper part of the flask as'indicate'd by the line 3 3 of Figure 2. l

Figure 4 is a fragmentaryv section take on the line 4 4 of Figure 1.

Figure 5 is a section on the line 5 5 of Figure 1.

Figure 6 is a section of the upper part of a flask having a modified form of my invention, the section being taken as on the line 6 6 of Figure 1.

Referring to the drawing in detail, a molders flask of ordinary construction is illustrated in Figures 1 and 2. As shown, the flask comprises an upper part 10 and a lower part 11 which are normally in superposed relation. While for simplicity the flask shown on the drawing comprises but two parts, it will be understood that as many more parts as may be found desirable or necessary may be used. Where the flask is constructed of wood, each part is preferably 1926. serian No. 110,361.

built up of end pieces 12 and side pieces 13, these pieces being secured together by any suitable means such as nails, bolts7 or the like. Handles 14 may be provided on the side pieces 13 of the upper part or cope 10 to facilitate manipulation thereof. Dowels 15 may also be provided on the lower face of the cope to enter recesses 16 in the lower partA so as t0 secure mutual registration of the two parts. The dowels 15 are commonly cast on a plate 17 which is set into the contacting face of the upper part 10 of the flask, this `base plate 17 resting -on a perforated plate 18 set into the contacting face of the lower part of the flask or drag, the perforation in the plate 18 registering with the recess 16 into which the dowel 15 enters. EX- cept for the relatively short plates 17 and 18, the contacting faces between the two parts of a wooden flask as heretofore made are of the wood itself. When molten metal is poured into the sand held by the flask, the extremely high temperatures cause gas to be Vformed in the sand which works its way out through the voids and interstices thereof and emerges in part between the contacting faces of adjacent parts of the flask. These gases usually emerge at such high temperatures as to ignite spontaneously upon reaching the open air, the flames of the burning gases causing the wood of the flask to catch llre in the vicinity of the crack between the two parts. I' This injures the flask since the wood thereof is frequently burned or charred considerably before the flames are extinguished. In order to prevent such injury, I provide a channel 19 in one or both of theV contacting faces of adjacent parts, this channel preferably extending all the way around the flask so as to provide a duct in which gases may collect as they find their way out between the parts. In order to lead off the gases .from the channel 19, I provide one or more vents 20 which may be cut through the wall of one of the parts of the flask or formed in one or more of the plates 17, or both, to connect the channel 19l with the open air at a point spaced from the line of contact of the two parts as shown in Figures 2 and 4. To protect the face of the part in the vicinity of the vent 20 when they are formed in the wall, I may mount a plate 21 of lire-resisting material, such as metal, asbestos, or the like, this plate having a perforation -2,2 registering with the vent 20.

Any desired number of vents 2O may be supplied. InFigure 1 four are shovvn, one for each corner ofthe flask, but mere or less may be suppliedV according to conditions.

There extreme gas conditions "are encountered, I may further" protect the contacting portions of the parts 10, l1, as shoiyn in Figure 6. In this form, in addition to the channel 19 I provide a metal strip or piece 23 Which may be of any desired shape of cifoss section and is preferably ,set into .the contactingfacefof'each ofthe parts l0 .and 11, the strip 23 extendingffrom the .outer ,edge of -the face inwardly as far as the chair nel 1.9,. These strips 2,8 protect the outer edges .of :the 4parts 1.0 andll -from .flames ,of any gases which mayl escape betiveen'the parts to the openl air instead of passing off through the channel 19. and the vents 20. For average gaseonditions, the'edges may be protected' by'strips 23 of fire-resistant inaterial Without the additional protection afforded by the kchannel 19. In such cases, the strips may be sety into the Walls of the partis .of the flask as illustrated in Figure ,6, or may be in the form of relatively flat strips attivi-16d the Outer feces Qi the Parts with onek edge hush With a contacting face. Other different forifns of sheathing means may be used to protect the edges, such for exemple an ausl@ Stlr Set into. each. Palit of the flask, the faces of the strip being lflush respectively with the outer and contacting facesof the parts.

It is to be understood, that the invention is not to be limited by the embodiments shown and described herein, but is subject to such changes 'and modifications as fall Within the scQpe Of the appended claims.

I claim:

l. A molders 'flask having a plurality of parts normally in superposed relation With contacting faces, one ofeach pair of adjacent parts being provided with a channel in its contacting face, one of each Pili-r of adjacent parts having a vent 'connecting said channel with the open air.

2. A molders flask having a plurality of parts normally in superposed relation with contacting, faces, one of said parts having a channel' in its contacting face extending longitudinally thereof and spaced from the outer edge thereof, one of said parts being provided with a vent Yc onnecting Asaid channel with the open air :alt a point spaced from the plane of contact of the parts. "`3.'A"1`noldeis flask having a plurality of parts normally in superposed relation with contacting faces, one of said parts having a channelV in its contacting face extendinglongitudinally thereof and spaced from the outer edge thereof, one of said parts being lproyided a vent connecting said channel with the open air, and lire-resistant means surrounding said vent for protecting the surface ofthe flask adjacent vto said Vent. v

e. A molders .flask having a plurality of parts noigmally in'superposed relation with contacting facies ,'one of saidparts having a channel in -its contacting" face extending longitudinally thereof and spaced from'the outer edge th-ercef, said flask also being provided With vents connecting said channel with Jche open air, andl a plate of fire-re.- sistant material covering' the surface of the flask in the yicinity of the vent and, having a relfolaten theltethreueh regiteiias With seid vent.

5. A molders flash: having tivo parts normal-ly in superposed relation Withcon- Vtacting faces, one off Vsaid, parts having a channel in its contacting face extending longitudinally thereof and spaced from the outer edge thereef, fire-I'Gstell PeCGS Se@ into the contacting faces of the flask parts and extending from said outer edge inwardly as far as said channel, said flask also being provided with vents connecting said channel ,with the open air, andreresistant means associated with said Vents for protecting thel surface of the yflask in the vicinity of the vents.

@gli Wooden inolders flaskl having tivo parts normally in superposed relation with contacting faces, and lire-resistant means set into the cuter portions Ot Said contesting faces and flush therewith, Whereby'the outer portions and edges of the contacting faces are of fire-resistant material. n

In testimony whereof I have afiiged my signature.

HAROLD D. Bicironn. 

